TMS320VC33 datasheet(30/59 Pages) TI2

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TMS320VC33

DIGITAL SIGNAL PROCESSOR

SPRS087E -- FEBRUARY 1999 -- REVISED JANUARY 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251--1443

clock circuit timing (continued)

The following tables define the timing requirements and switching characteristics for EXTCLK.

timing requirements for EXTCLK, all modes (see Figure 17 and Figure 18)

MIN

MAX

UNIT

Rise time EXTCLK

F=Fmax, x0.5 and x1 modes

tr(EXTCLK)

Rise time, EXTCLK

F<Fmax

Fall time EXTCLK

F=Fmax, x0.5 and x1 modes

tf(EXTCLK)

Fall time, EXTCLK

F<Fmax

x5 mode

tw(EXTCLKL)

Pulse duration, EXTCLK low

x1 mode

5.5

tw(EXTCLKL)

Pulse duration, EXTCLK low

x0.5 mode

4.0

x5 mode

tw(EXTCLKH)

Pulse duration, EXTCLK high

x1 mode

5.5

tw(EXTCLKH)

Pulse duration, EXTCLK high

x0.5 mode

4.0

x5 PLL mode

tdc(EXTCLK)

Duty cycle, EXTCLK [tw(EXTCLKH) /tc(H)]

x1 and x0.5 modes, F = max

tdc(EXTCLK)

Duty cycle, EXTCLK [tw(EXTCLKH) / tc(H)]

x1 and x0.5 modes, F = 0 Hz

100

x5 mode

83.3

200

Cycle time, EXTCLK, VC33-120

x1 mode

16.7

Cycle time, EXTCLK, VC33 120

x0.5 mode

tc(EXTCLK)

x5 mode

66.7

200

Cycle time, EXTCLK, VC33-150

x1 mode

13.3

Cycle time, EXTCLK, VC33 150

x0.5 mode

x5 mode

Frequency range, 1/tc(EXTCLK), VC33-120

x1 mode

Frequency range, 1/tc(EXTCLK), VC33 120

x0.5 mode

100

MHz

Fext

x5 mode

MHz

Frequency range, 1/tc(EXTCLK), VC33-150

x1 mode

Frequency range, 1/tc(EXTCLK), VC33 150

x0.5 mode

100

switching characteristics for EXTCLK over recommended operating conditions, all modes

(see Figure 17 and Figure 18)

PARAMETER

MIN

TYP

MAX

UNIT

Vmid

Mid-level, used to measure duty cycle

0.5 * DVDD

Delay time, EXTCLK to H1 and x1 mode

4.5

td(EXTCLK-H)

Delay time, EXTCLK to H1 and

x0.5 mode

4.5

tr(H)

Rise time, H1 and H3

tf(H)

Fall time, H1 and H3

td(HL-HH)

Delay time, from H1 low to H3 high or from H3 low to H1 high

--1.5

1.5

x5 PLL mode

1/(5 * fext)

tc(H)

Cycle time, H1 and H3

x1 mode

1/fext

tc(H)

Cycle time, H1 and H3

x0.5 mode

2/fext

TMS320VC33 Datasheet(PDF) 30 Page - Texas Instruments

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